How would you preform a scenario analyses in excel?

[1] use 10 years on basis of loan life and equipment life
[2] half of previous year's growth rate until normalization
[3] historical cost of Associates
Service of Financing
Beginning debt		320.0	288.0	256.0	224.0	192.0	160.0	128.0	96.0	64.0	32.0	0.0
Interest payments			19.2	17.3	15.4	13.4	11.5	9.6	7.7	5.8	3.8	1.9
Principal payments			32.0	32.0	32.0	32.0	32.0	32.0	32.0	32.0	32.0	32.0
Other bank charges			0.5	0.5	0.5	0.5	0.5	0.5	0.5	0.5	0.5	0.5
Lease payments			52.6	54.2	55.8	57.5	59.2	61.0	62.8	64.7	66.6	68.6
Total service			103.8	103.4	103.1	102.9	102.7	102.6	102.5	102.4	102.5	102.5
Tax shields			21.5	21.4	21.3	21.3	21.2	21.2	21.1	21.1	21.1	21.2
Operating cash flow			183.1	218.8	233.7	240.7	247.9	255.3	263.0	270.9	279.0	287.4